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Dynamic Late Merge Control Concept
For
Work Zones
On
Rural Freeways
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SPEEDLIMIT
75FINES
DOUBLED
RIGHT LANE
CLOSED 1 MILE
RIGHT LANE
CLOSED 1/2 MILE
REDUCED
SPEEDAHEAD
ROADWORK
2 MILES
FINES FORSPEEDING
DOUBLED INWORK ZONES
ENDROAD WORK
Thank YouDrive Safely
FLASHINGARROW PANEL
SPEEDLIMIT
75FINES
DOUBLED
SPEEDLIMIT
75
SPEEDLIMIT
55FINES
DOUBLED
Conventional Merge TCP
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Basic Approaches
• Early Merge
• Late Merge
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Early Merge
• Static
• Dynamic
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Indiana Lane Merge
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Conventional Merge
Indiana Lane Merge
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Forced Merges
• Indiana: 0.4/hour
• Conventional: 20/hour
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Capacity
• Indiana: 1540 pcph
• Conventional: 1460 pcph
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Late Merge
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USE BOTH LANES
TO MERGE POINT
ROADWORK
1 MILES
LEFT LANECLOSED 1/2 MILE
50MPH
CMS
45MPH
LEFT LANECLOSED 1500 FT
40MPH
LEFT LANECLOSED 1000 FT
40MPH
FlashingArrow Board
MERGE HERE
TAKE YOUR TURN
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Conventional Merge
Late Merge
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Conventional Merge
Late Merge
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Conclusions• Early & Late Merge Performed Better
Than Conventional Merge
• Lower Volumes:
Early Merge May Be Safer
• Higher Volumes:
Late Merge May Be Safer
& More Efficient
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LEDLIGHTS
(SOLAR POWERED)
VEHICLESENSOR ON BACK
EACH SENSOR CONTROLS THENEXT UPSTREAM SIGN'S FLASHERS
DETECTED ZONE FOR
STATION 2
DETECTED ZONE FOR
STATION 3
USE BOTH LANES TO
MERGE POINT
WHENFLASHING
DETECTED ZONE FOR
STATION 1
LEFT LANE RESTRICTION(WORK ZONE)
USE BOTH LANES TO
MERGE POINT
WHENFLASHING
USE BOTH LANES TO
MERGE POINT
WHENFLASHING
USE BOTH LANES TO
MERGE POINT
WHENFLASHING
USE BOTH LANES TO
MERGE POINT
WHENFLASHING
USE BOTH LANES TO
MERGE POINT
WHENFLASHING
Dynamic Late Merge
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Operational Issue
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Research Needed
• Volume Thresholds for Transition Between Early & Late Merge
• Driver Information Needs
• Warrants for Implementation
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